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Version using MEMS microphone and CODEC for the program "F746_RealtimeSpectrumAnalyzer". "F746_RealtimeSpectrumAnalyzer" の入力を MEMS のマイクと CODEC に変更.このプログラムは Tomona Nanase さんが作成し DISCO-F746NG_Oscilloscope の名前で登録しているプログラムで, CODEC を使って入力する部分を参考にして作成.このプログラムの説明は,CQ出版社のインターフェース誌,2016年4月号に掲載.
Dependencies: BSP_DISCO_F746NG BUTTON_GROUP LCD_DISCO_F746NG TS_DISCO_F746NG UIT_FFT_Real mbed
main.cpp
- Committer:
- MikamiUitOpen
- Date:
- 2016-02-17
- Revision:
- 6:16d668c3aa1e
- Parent:
- 5:3465b7b7acb8
- Child:
- 7:f863d0a84d11
File content as of revision 6:16d668c3aa1e:
//------------------------------------------------ // Realtime spectrum analyzer // Input: MEMS microphone or CN11 // // 2016/02/17, Copyright (c) 2016 MIKAMI, Naoki //------------------------------------------------ #include "main.h" using namespace Mikami; int16_t audio_in_buffer[BufferSize]; __IO bool audio_in_buffer_captured = false; __IO int32_t audio_in_buffer_offset = 0; __IO int32_t audio_in_buffer_length = 0; // Switching input device void SwitchInputDevice(int sw) { uint16_t dev = (sw == 0) ? INPUT_DEVICE_DIGITAL_MICROPHONE_2 : INPUT_DEVICE_INPUT_LINE_1; InitRunAudioIn(dev, I2S_AUDIOFREQ_16K); } int main() { const int FS = 8000; // Sampling frequency: 8 kHz const int N_DATA = N_DATA_; // Number of data to be analyzed const int N_FFT = 512; // Number of date for FFT const int X_WAV = 44; // Origin for x axis of waveform const int Y_WAV = 36; // Origin for y axis of waveform const int X0 = 40; // Origin for x axis of spectrum const int Y0 = 234; // Origin for y axis of spectrum const float DB1 = 2.4f; // Pixels for 1 dB const int BIN = 1; // Pixels per bin const int W_DB = 60; // Range in dB to be displayed const int X0_BTN = 340; // Holizontal position for left of buttons const uint32_t BACK_COLOR = 0xFF006A6C; // Teal green const uint32_t INACTIVE_COLOR = BACK_COLOR & 0xD0FFFFFF; const uint32_t TOUCHED_COLOR = 0xFF7F7FFF; const uint32_t ORIGINAL_COLOR = 0xFF0068B7; const uint32_t INACTIVE_TEXT_COLOR = LCD_COLOR_GRAY; const uint32_t AXIS_COLOR = 0xFFCCFFFF; const uint32_t LINE_COLOR = LCD_COLOR_CYAN; LCD_DISCO_F746NG lcd; // Object for LCD display TS_DISCO_F746NG ts; // Object for touch pannel lcd.Clear(BACK_COLOR); // Setting of button group const string RUN_STOP[2] = {"RUN", "STOP"}; ButtonGroup runStop(lcd, ts, X0_BTN, 10, 60, 40, ORIGINAL_COLOR, BACK_COLOR, 2, RUN_STOP, 5, 0, 2); runStop.Draw(1, INACTIVE_COLOR, INACTIVE_TEXT_COLOR); const string MIC_LINE[2] = {"MIC", "LINE"}; ButtonGroup micLine(lcd, ts, X0_BTN, 65, 60, 40, ORIGINAL_COLOR, BACK_COLOR, 2, MIC_LINE, 5, 0, 2); micLine.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); const string METHOD[3] = {"FFT", "Linear Pred.", "Cepstrum"}; ButtonGroup method(lcd, ts, X0_BTN, 120, 125, 40, ORIGINAL_COLOR, BACK_COLOR, 3, METHOD, 0, 5, 1); method.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); // End of button group setting WaveformDisplay waveDisp(lcd, X_WAV, Y_WAV, N_DATA, 9, AXIS_COLOR, LINE_COLOR, BACK_COLOR); SpectrumDisplay disp(lcd, N_FFT, X0, Y0, -45, DB1, BIN, W_DB, FS, AXIS_COLOR, LINE_COLOR, BACK_COLOR); // Linear prediction: order = 10 // Cepstral smoothing: highest quefrency = 40 Selector analyzer(disp, N_DATA, N_FFT, 10, 40); // Initialize the infinite loop procedure int select = -1; int sw = 0; // 0: mic, 1: line int stop = 0; int16_t sn[N_DATA]; // Wait for "RUN" button touched while (!runStop.Touched(0, TOUCHED_COLOR)) {} // Start of spectrum analyzing method.DrawAll(ORIGINAL_COLOR); while (true) { if (runStop.Touched(0, TOUCHED_COLOR)) { SwitchInputDevice(sw); micLine.Draw(sw, TOUCHED_COLOR); micLine.Redraw(1-sw); } runStop.GetTouchedNumber(stop, TOUCHED_COLOR); if (stop == 0) { if (micLine.GetTouchedNumber(sw, TOUCHED_COLOR)) SwitchInputDevice(sw); if (audio_in_buffer_captured) { // Waveform display int32_t index = audio_in_buffer_offset; // right mic. or left line // int32_t index = audio_in_buffer_offset + 1; // left mic. or right line Decimate(N_DATA, index, audio_in_buffer, sn); waveDisp.Execute(sn); // Spectrum analysis and display analyzer.Execute(sn, select); audio_in_buffer_captured = false; } else if (method.GetTouchedNumber(select, TOUCHED_COLOR)) analyzer.Execute(sn, select); } else { if (runStop.Touched(1)) { StopAudioIn(); // Stop sampling micLine.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); } if (method.GetTouchedNumber(select, TOUCHED_COLOR)) analyzer.Execute(sn, select); } } }